Diaphragm fuel pumps should be replaced or overhauled:
A common cause for this problem is fuel starvation due to improper installation of the fuel pump. Make sure that the fuel lines are not crossed; that is, the inlet line should be connected to the inlet side of the pump (marked “IN” on the top of the port) and the outlet line should be attached to the fuel pump outlet port. Fuel should be present at the inlet side of the fuel pump.
Improper installation of the fuel pump may result in a misalignment of the operating lever with the operating plunger in the accessory case. If so, there will be no movement of the lever and no pumping motion to provide fuel flow. If misalignment is found upon removal of the pump, the lever is probably damaged or broken. If misalignment of the operating lever has occurred, it will require inspection and repair by a qualified technician.
Leaking fuel or oil through the fuel pump overboard drain line indicates the rotary seal is running dry or contamination happened in the field. Your fuel pump should be replaced before further flight.
The most common reasons for low fuel flow/pressure are the following:
Fluctuating fuel pressure can be the result of the following:
The fuel selector valve works in unscreened fuel. Contaminated fuel can cause selector valve seal damage. When fueling from possibly contaminated fuel sources McFarlane recommends the use of a fuel filter, such as Mr. Funnel or another filtering device, to reduce trash in the fuel system.
C J Aviation Overhauled Fuel Pumps
FAA and EASA approved certified repair station
Note: A *refundable core charge is included in the price of all C J Aviation FAA-PMA pumps.
*When a qualified core is returned within 30 days of the original invoice date.
All overhauled Fuel Pumps come with two o-rings and a drain plug.
FAA-PMA Approved Fuel Pumps Also Available
C J Aviation has been manufacturing the best fuel pumps in the industry for more than 30 years, offering direct replacement for Duke fuel pumps on Beechcraft, Cessna, Diamond, Maule, Mooney, Lake and Navion aircraft.
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For more information go to Fuel Pumps.
For additional products visit Fuel Pump Components.
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